Light-emitting chip and light-emitting substrate

1. A light-emitting chip, comprising: a base substrate and at least two sub-light-emitting chips disposed on a side of the base substrate, wherein each sub-light-emitting chip comprises a first semiconductor layer, a second semiconductor layer and a light-emitting layer located between the first semiconductor layer and the second semiconductor layer, which are stacked; wherein the at least two sub-light-emitting chips are connected in series to form a series group of sub-light-emitting chips, and the light-emitting chip further comprises a first electrode and a second electrode, the first electrode is connected to a sub-light-emitting chip at a first terminal of the series group of sub-light-emitting chips and the second electrode is connected to a sub-light-emitting chip at a second terminal of the series group of sub-light-emitting chips; wherein in a direction perpendicular to the base substrate, the first electrode and the second electrode are located on a side of the second semiconductor layer away from the light-emitting layer, and a second insulating layer is disposed between the first and second electrodes and the second semiconductor layer; the second insulating layer is provided with a first via hole exposing a sub-light-emitting chip at the first terminal of the series group of sub-light-emitting chips and a second via hole exposing a sub-light-emitting chip at the second terminal of the series group of sub-light-emitting chips; the first electrode is connected to the sub-light-emitting chip at the first terminal of the series group of sub-light-emitting chips through the first via hole, and the second electrode is connected to the sub-light-emitting chip at the second terminal of the series group of sub-light-emitting chips through the second via hole.

2. The light-emitting chip according to claim 1, wherein a vertical projection of any one of the sub-light-emitting chips in the series group of sub-light-emitting chips on the base substrate overlaps with a vertical projection of at least one of the first electrode and the second electrode on the base substrate.

3. The light-emitting chip according to claim 1, wherein in a direction parallel to the base substrate, the sub-light-emitting chips in the series group of sub-light-emitting chips are arranged side by side along a first direction of the base substrate; or, the sub-light-emitting chips are arranged in a triangle; or, the sub-light-emitting chips are disposed in a rectangle.

4. The light-emitting chip according to claim 1, further comprising a series electrode disposed on a side of the base substrate, wherein a first terminal of the series electrode is connected to the first semiconductor layer of one of adjacent sub-light-emitting chips, and a second terminal of the series electrode is connected to the second semiconductor layer of the other one of the adjacent sub-light-emitting chips.

5. The light-emitting chip according to claim 4, wherein in a direction perpendicular to the base substrate, a first insulating layer is disposed between the first terminal of the series electrode and the second semiconductor layer of one of the adjacent sub-light-emitting chips; and/or the first insulating layer is disposed between the second terminal of the series electrode and the first semiconductor layer of the other one of the adjacent sub-light-emitting chips.

6. The light-emitting chip according to claim 1, wherein the second insulating layer is made of a reflective material.

7. The light-emitting chip according to claim 1, wherein the sub-light-emitting chips are rectangular or triangular.

8. A light-emitting substrate, comprising: a drive back plate and a light-emitting chip disposed on a side of the drive back plate, wherein the light-emitting chip is the light-emitting chip according to claim 1.

9. The light-emitting substrate according to claim 8, wherein a vertical projection of any one of the sub-light-emitting chips in the series group of sub-light-emitting chips on the base substrate overlaps with a vertical projection of at least one of the first electrode and the second electrode on the base substrate.

10. The light-emitting substrate according to claim 8, wherein in a direction parallel to the base substrate, the sub-light-emitting chips in the series group of sub-light-emitting chips are arranged side by side along a first direction of the base substrate; or, the sub-light-emitting chips are arranged in a triangle; or, the sub-light-emitting chips are disposed in a rectangle.

11. The light-emitting substrate according to claim 8, further comprising a series electrode disposed on a side of the base substrate, wherein a first terminal of the series electrode is connected to the first semiconductor layer of one of adjacent sub-light-emitting chips, and a second terminal of the series electrode is connected to the second semiconductor layer of the other one of the adjacent sub-light-emitting chips.

12. The light-emitting substrate according to claim 8, wherein in a direction perpendicular to the base substrate, the first electrode and the second electrode are located on a side of the second semiconductor layer away from the light-emitting layer, and a second insulating layer is disposed between the first and second electrodes and the second semiconductor layer; the second insulating layer is provided with a first via hole exposing the sub-light-emitting chip at the first terminal of the series group of sub-light-emitting chips and a second via hole exposing the sub-light-emitting chip at the second terminal of the series group of sub-light-emitting chips; the first electrode is connected to the sub-light-emitting chip at the first terminal of the series group of sub-light-emitting chips through the first via hole, and the second electrode is connected to the sub-light-emitting chip at the second terminal of the series group of sub-light-emitting chips through the second via hole.